science

Horikawa H-23

Horikawa H-23 is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Horikawa H-23 rather than just read about it. In short: The Horikawa H-23B-2 is a two-seat training glider designed and built in Japan in the 1950s. It was produced in small numbers.

Key takeaways

Horikawa H-23 belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Horikawa H-23 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Horikawa H-23 from memory before moving on to harder problems.

Reference excerpt

The Horikawa H-23B-2 is a two-seat training glider designed and built in Japan in the 1950s. It was produced in small numbers.

Design and development The Horikawa H-23B-2 is a more advanced trainer than the same designer's H-22B-3. Ikuo Horikawa was a director of the Hagiwara Glider Company which built both types. It is a high braced wing monoplane, with a pair of V-form struts supporting the wing on both sides. The wing is a two spar structure, covered with a mixture of plywood and fabric. It is tapered and has 1° 20' of dihedral. There are wooden, fabric covered ailerons and spoilers on the upper surface. The H-23B-2 has a steel tube framed, fabric covered, polygonal section fuselage. Its two-seat tandem cockpit is enclosed, the top of the canopy blending into the wing leading edge. Aft, the fuselage is built up to the trailing edge but tapers away rearward. The tail unit has cantilever, straight edged, fabric covered wooden structured surfaces with the horizontal tail on top of the fuselage and placed well forward of the rudder. The undercarriage is a fixed monowheel, assisted by a rubber sprung skid under the nacelle and a tail skid. The first flight was made on 10 September 1956; at least eight were produced.

Specifications Data from Jane's All the World's Aircraft 1966-67 The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde Volume IIGeneral characteristics Crew: Two Length: 7.26 m (23 ft 10 in) Wingspan: 13.15 m (43 ft 2 in) Wing area: 17.2 m2 (185 sq ft) Aspect ratio: 10.0 Airfoil: Göttingen 532 at root, Göttingen 676 at tip Empty weight: 210 kg (463 lb) equipped Gross weight: 380 kg (838 lb) Performance

Stall speed: 55 km/h (34 mph, 30 kn) Never exceed speed: 150 km/h (93 mph, 81 kn) Rough air speed max: 110 km/h (68.4 mph; 59.4 kn) Aerotow speed: 110 km/h (68.4 mph; 59.4 kn) Winch launch speed: 110 km/h (68.4 mph; 59.4 kn) Maximum glide ratio: 18:1 best at 68.5 km/h; 37 kn (42.5 mph) Rate of sink: 1.09 m/s (215 ft/min) minimum at 61.9 km/h; 33.4 kn (38.5 mph) Wing loading: 22.1 kg/m2 (4.5 lb/sq ft)

Worked examples

Example 1 — a first encounter with Horikawa H-23

Start with the simplest possible case. Write down what Horikawa H-23 claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Horikawa H-23 before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Horikawa H-23 ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Horikawa H-23

In research: Horikawa H-23 appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Horikawa H-23 in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Horikawa H-23 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1950s Japanese aircraft, Aircraft first flown in 1956, Glider aircraft, so understanding it makes those chapters shorter.
In everyday life: Look for Horikawa H-23 outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Horikawa H-23 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Horikawa H-23 means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Horikawa H-23 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Horikawa H-23 in simple terms?

The Horikawa H-23B-2 is a two-seat training glider designed and built in Japan in the 1950s. It was produced in small numbers.

Why does Horikawa H-23 matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Horikawa H-23?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Horikawa H-23.